Electroconductivity of heterogeneous ion-exchange membranes MK-40, MK-41, Ralex CM(H)-PP, MA-41, Ralex AM (H)-PP in ammonium nitrate, potassium nitrate, ammonium chloride and sodium chloride solutions was measured. The contribution of the gel, inter-gel and mixed phases of a heterogeneous membrane into the specific conductance of the sample was determined. By the method of high-frequency impedance spectroscopy the electrochemical characteristics of membranes MK-40 and MA-41 were Studied. It is shown that the radius of the semicircle of the impedance hodograph is inversely proportional to the diffusion coefficient of a counter ion and directly proportional to the fraction of the inter-gel phase of the membrane. To measure the conductivity of the samples the contact-difference method was applied. (C) 2017 Elsevier B.V. All rights reserved.